Alexander Kemper - Towards early quantum advantage with impurity embedding methods - IPAM at UCLA

Recorded 17 February 2026. Alexander Kemper of North Carolina State University presents "Towards early quantum advantage with impurity embedding methods" at IPAM's Bridging the Gap Between NISQ and FTQC Workshop.
Abstract: The accurate theoretical description of materials with strongly correlated electrons is a formidable challenge, at the forefront of condensed matter physics and computational chemistry alike, and it is one of the targets for quantum computing. Dynamical Mean Field Theory (DMFT) is a successful approach that predicts behaviors of such systems by incorporating some correlated behavior, but it is limited by the need to calculate the Green’s function for the impurity model. This work proposes a framework for DMFT calculations on quantum computers, focusing on near-term applications. It leverages the structure of the impurity problem, combining a low-rank Gaussian subspace representation of the ground state and a compressed, short-depth quantum circuit that joins the Gaussian state preparation with the time evolution to compute the necessary Green’s functions. We demonstrate the convergence of the DMFT algorithm using the Gaussian subspace in a noise-free setting, and show the hardware viability of the circuit compression by extracting the impurity Green’s function on IBM quantum processors for a single impurity coupled to three bath orbitals (8 physical qubits and 1 ancilla). We discuss the potential paths forward towards realizing this use case of quantum computing in materials science.
Learn more online at: https://www.ipam.ucla.edu/programs/workshops/bridging-the-gap-between-nisq-and-ftqc/ Receive SMS online on sms24.me

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